PartnerNOC

If this shows blank, then either there is a DNS zone for this site which can be removed by running '/scripts/killdns example2.com' or it has some partial entries in /var/cpanel/userdata/ or /var/cpanel/users/ folders which need to be forcefully removed.

PartnerNOC

Additionally, I've also seen this when the domain was manually added to the server using the 'Add DNS Zone' feature, or was left on the server from a previous owner/user. You must first delete any corresponding DNS zone for the domain before you can park it.